From Britney Spears to Cher, Aguilera transformed herself like never before.

"On my team you're gonna learn how to twerk," she said for her spot-on impression of Miley Cyrus. "It's gonna be a party in the U.S.A., ya'll."

Next, the 34-year-old singer converted into super-private songstress Sia. Accessorized with a huge white wig that covered most of her face and a child dressed exactly the same, Aguilera was unrecognizable.

"Hey ya'll," she said dressed as Spears from her "… Baby One More Time" days. "Join Team Britney, b--ches."

Impressions of Lady Gaga and Shakira followed. But her arguably best impersonation of all was the diva of all musical divas, Cher.

"What does this button do?" she asked with the back of the chair still facing forward.

Once she turned around to reveal her Cher costume — a gigantic black curly wig, leather jacket and the singer's signature fishnet shirt — Aguilera said, "Are you kidding me? I have an Oscar for god's sake, an Emmy, a Tony."

She then asked if fellow coach Adam Levine was her "accountant."

Back to Shakira, who has been a coach on the show in the past, Aguilera said, "I bet you like your coaches like your coffee, spicy and Colombian."